CHAPTER 3 Engine Thrust and Performance Parameters

3.1 Introduction


Trent 1000 Turbofan Engine. Source: Reproduced with permission from Rolls-Royce plc

An aircraft engine is designed to produce thrust F (or sometimes lift in VTOL/STOL aircraft, e.g., the lift fan in the Joint Strike Fighter, F-35). In an airbreathing engine, a mass flow rate of air and fuel are responsible for creating that thrust. In a liquid rocket engine, the air is replaced with an onboard oxidizer , which then reacts with an onboard fuel to produce thrust. Although we will discuss the internal characteristics of a gas turbine engine in Chapter 4, it is instructive to show the station numbers in a two-spool turbojet engine with an afterburner. Figure 3.1 is schematic drawing of such engine. The air is brought in through the air intake, or inlet, system, where station 0 designates the unperturbed flight condition, station 1 is at the inlet (or cowl) lip, and station 2 is at the exit of the air intake system, ...

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